After enabling this option you will get email notification when your customers will leave their feedback. You just need to fill the below details.

1. Sender Name - the name will be displayed to customers in email while sending feedback mail.

2. Sender Email - feedback email will send from this mail. 

3. Recipient Emails - when a customer left feedback you will get a notification in this mail id. ( you can add multiple emails in this field)

Please follow the below steps:

Go to App admin --> Settings --> Settings --> Layout Settings. 

When you scroll down the page you will see the Email Notification option.